Acclaimed screenwriter Harold Ramis passed away at the age of 69 on Monday.

Ramis, who wrote both “Ghostbusters” films, died of complications related to a long battle with auto-immune inflammatory vasculitis, Deadline reports.

Along with writing and co-starring in the “Ghostbusters” franchise, he was responsible for some of the most successful comedies from more than three decades, including “Animal House,” “Meatballs,” “Caddyshack,” “Stripes” and “Groundhog Day.”

Ramis often acted in his films, including his role of Dr. Egon Spengler in both “Ghostbusters” films and as Russell Ziskey in “Stripes.”

More recently, he wrote and directed the Robert De Niro-starring “Analyze This” and “Analyze That” movies, as well as 2009’s “Year One.”

Ramis was also attached to the proposed “Ghostbusters 3,” which has long been in development, but it is unclear if the film will move forward at all in the wake of his death.

Our thoughts are with his friends and family at this time. Name your favorite of Ramis’s movies in the comments section below.